Cut the chicken breast into bite-sized pieces.
Slice the cabbage, onion, and green onion.
In a bowl, mix the chicken breast with the measured gochujang, olive oil, soy sauce, minced garlic, red pepper powder, and erythritol to marinate.
Place the marinated chicken breast in a pan and cook over medium heat.
Add the vegetables and stir-fry together until fully cooked.